1/*
2 * Copyright (C) 2013 DroidDriver committers
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package com.google.android.droiddriver.scroll;
17
18
19import com.google.android.droiddriver.DroidDriver;
20import com.google.android.droiddriver.UiElement;
21import com.google.android.droiddriver.finders.Finder;
22import com.google.android.droiddriver.scroll.Direction.DirectionConverter;
23import com.google.android.droiddriver.scroll.Direction.PhysicalDirection;
24
25/**
26 * An abstract base class for implementing the <a
27 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>,
28 * forwarding calls to all methods of {@link ScrollStepStrategy} to delegate.
29 */
30public abstract class ForwardingScrollStepStrategy implements ScrollStepStrategy {
31
32  protected ForwardingScrollStepStrategy() {}
33
34  /**
35   * Returns the backing delegate instance that methods are forwarded to.
36   */
37  protected abstract ScrollStepStrategy delegate();
38
39  public boolean scroll(DroidDriver driver, Finder containerFinder, PhysicalDirection direction) {
40    return delegate().scroll(driver, containerFinder, direction);
41  }
42
43  @Override
44  public final DirectionConverter getDirectionConverter() {
45    return delegate().getDirectionConverter();
46  }
47
48  @Override
49  public void beginScrolling(DroidDriver driver, Finder containerFinder, Finder itemFinder,
50      PhysicalDirection direction) {
51    delegate().beginScrolling(driver, containerFinder, itemFinder, direction);
52  }
53
54  @Override
55  public void endScrolling(DroidDriver driver, Finder containerFinder, Finder itemFinder,
56      PhysicalDirection direction) {
57    delegate().endScrolling(driver, containerFinder, itemFinder, direction);
58  }
59
60  @Override
61  public void doScroll(UiElement container, PhysicalDirection direction) {
62    delegate().doScroll(container, direction);
63  }
64}
65